Brake



Aug. 9, 1932. w. H. DELAHAYEY BRAKE Fi1ed Aug. 14, 1931 INVENTOR: WALTER H DELAHAYE.

ATTORNEY. I

- or for service purposes.

Patented Aug. 9, 1932 UNITED STATES PA'KIIENVT OFFICE WALTER H. DELA HAYE, OF OTTAWA, ONTARIO, CANADA, ASSIGNOR TO BEND IX COMPANY, OF SOUTH BEND, INDIANA, A CORPORATION OF ILLINOIS BRAKE Application filed August 14, 1931. Serial No. 557,024.

7 an improved brake of this type and more particularly to provide a compact and efficient applying. mechanism for a plurality of service braking means and internal braking means for parking purposes.

According to the invention a pair of main shoes are provided together with a servo shoe and a parking shoe, and separate means are provided for applying the shoes for parking The invention consists in the construction,

combination and arrangement of parts hereinafter described and more particularly pointed out in the appended claims.

Referring now to the accompanying drawing, which illustrates, by way of example,

.two convenient embodiments of the invention,

Figure 1 is an elevation of one form of the improved brake;

Figure 2 is a section substantially on the line 2-2 of Figure 1, and

Figure 3' is a fragmentary-elevation of a modified form of the invention.

The brake comprises the usual rotary drum 1 and stationary disc 2. The numerals 3 and 4 indicate two main shoes pivoted on the disc 2 at 5 and 6 respectively. A parking shoe 7 is also provided at 5 and a servo shoe 8 1s pivotally connected-at 9 to the free end of the main shoe 3. The adjacent ends of shoes 4 and 8 are connected with a toggle 10, 11, the lever 10 of which is extended and provid' ed at its free end with a suitably inclined surface 12 engaged by a roller 13 mounted on an arm 14. The arm 14 is arranged to be rocked, for example, by .a lever 15 through the medium of a shaft 16. Surrounding the shaft 16 is a sleeve 17 (Figure 2) which carries a pair of oppositely extending arms 18 and 19. The outer end of the sleeve 17 is c0n--" nected to a lever 20. The levers 15 and 20 are connected to the usual tension rods21 and 22 connected to the operating mechanism (not shown). I

A link 23 is pivotally connected at its ends to the arm 18 and the parking shoe 7, respectively, and the arm 19 carries a pin 24 engaging a slot 25 in the toggle lever 11.

It will be seen that if the lever 15 is actuated by the rod. 21 the arm 14 will be rocked to the right. The roller 13 rolls on the surface 12 and expands the shoes 3, 4 and 8 into engagement with the drum. The servo action of shoe 8 assists the application of the main shoes.- I a Alternatively, when the drum 1 is either rotating or stationary, the lever 20 may be actuated to cause a counterclockwise rotation of arms 18 and 19. The parking shoe? is thus directly applied through the medium of link 23, and the remaining shoes are applied through the pin and slot connection 24, 25 and the toggle 10, 11.

The construction shown in Figure 3 is exactly the same in principle as that shown in Figures 1 and 2. In this modification the-inclined surface 12 is provided on an angular extension 11a of the toggle lever 11, and the arm 14 projectsupwardlyinstead of downwardly. Otherwise, the construction and operation are the same as those described in connection with Figures 1 and 2, and it is believed that the operation will be clear without further description.

The foregoing description and accompanying drawing is given by way of example only, and any further modifications within the scope of the appended claims may be resorted to without departing from the invention.

1. In a brake, a main] shoe having a servo action, a second main shoe and anindependentshoe, means for operating the first and second named shoes and independent means for operating the first and last named shoes.

2. In a brake, a main shoe, a servo shoe operating said main shoe, a second main shoe and an independent shoe, means for operating the servo shoe and the second main shoe and means for operating the servo shoe and the independent shoe. I

3. In combination with a three shoe servo brake, an independent shoe, means for operating the three shoes and means for \simul- I taneously operating the servo shoe and the independent shoe.

4. In a brake, a pair of anchored shoes, a servo shoe for operating one of said shoes, an

independent anchored shoe, means for operating the three first mentioned shoes and means for operating the servo shoe, its controlled main shoe and the independent shoe.

5. In a brake, a pair of anchored main shoes, a servo shoe pivoted to the free end of one main shoe, an independent shoe anchored at one end, a toggle connected to one of the main shoes and the servo shoe, means for directly actuating said toggle and also actuating said independent shoe, and a second applying means for directly actuating said independent shoe and also for actuating said toggle.

6. In a brake, a pair of anchored main shoes, a servo shoe pivoted to the free end of one main shoe, a fourth shoe anchored at one end, a toggle connected to one of the main shoes and the servo shoe, applying means comprising a lever, bearing directly on a part ofthe toggle, and a second applying means comprislng an arm having a pm and slot connection with. a part of the toggle and an arm pivotally connected to the free end of said fourth shoe.

In testimony'whereof I have afiixed my signature.

WALTER H. DELAHAYIEL. 

